I have the requirements and instructions for beating Dogadon below.
Bananas needed to enter
boss: 120
Kong to use
for the boss: Diddy Kong
Special abilities
needed for the boss: None
To beat Dogadon, dodge the fireballs that
he spits out. When he sits down on the platform, howls and snaps his fingers
(he does something or other with his hands), throw a TNT barrel at him.
He'll be stunned and cry out.
Repeat this twice to hit Dogadon three
times. You've defeated him!
Result of returning
this boss key: Access to the third and fourth levels